I Can't Remember...

A girl by the name of Alexandra or Alex as they call her, ends up waking up in a military compound in a country that has been split in half by a civil war between the Rebel's and the Pure's. She then realizes, she remembers nothing of her past and must rely on others to tell her. But, the story she is given doesn't add up. She's said to be a sixteen year old soldier for the Pure's and is said that she has given her life to fight for her cause on the Pure side. As she goes about, being force to believe the story she is told, she begins to get suspicious. What will she find out, and will she ever recover her lost memory?